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onsemi SZMMSZ24T1G
- Part No.:
- SZMMSZ24T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ24T1G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
SZMMSZ24T1G from onsemi is a 24 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 70 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 16.8 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ24T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener tolerance (±5%), thermal resistance (340°C/W), AEC−Q101 qualification, ESD rating (>16 kV HBM), and Pb−free SOD−123 packaging for automated assembly.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 24 V output across load variations by conducting reverse current above its breakdown threshold. It exhibits a positive temperature coefficient near 24 V, typical of mid-voltage Zeners, and supports pulse operation up to 1 W per Figure 4.
Designed for surface-mount use on FR−4/FR−5 boards, it delivers specified performance within −55°C to +150°C junction temperature range, with cathode polarity marked by band and solderable corrosion-resistant finish compliant with UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nominal / 25.2 V max at IZT = 5 mA - defines regulated voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 70 Ω max at IZT = 5 mA, f = 1 kHz - determines regulation stiffness and AC ripple rejection capability |
| Reverse Leakage (IR) | 0.05 μA max at VR = 16.8 V - ensures minimal standby current in undervoltage clamp or reference bias networks |
| Thermal Resistance (RJA) | 340°C/W - quantifies junction-to-ambient heat transfer efficiency on standard PCB layout |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - confirms robustness against handling and system-level electrostatic discharge |
| AEC−Q101 Qualified | Yes - validates suitability for automotive electronics requiring stress-tested reliability and PPAP documentation |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, 1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant, solderable finish; cathode indicated by polarity band; maximum soldering temperature 260°C for 10 seconds; UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC−Q101 qualified and PPAP capable - enables direct use in Tier-1 automotive modules without requalification |
| Pb−free construction | SZ-prefix indicates automotive-specific site/control change compliance and RoHS-compliant lead-free plating |
| High-density packaging | SOD−123 footprint (1.60 × 2.69 mm) supports compact PCB layouts in space-constrained ECUs and ADAS sensors |
| ESD-hardened design | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in low-energy interface circuits |
| Stable regulation over temperature | Specified operation from −55°C to +150°C - maintains voltage reference integrity in engine bay and powertrain environments |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 24 V supply lines in body control modules against load dump transients up to 35 V. IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage protection by diverting surge current to ground. Use Value: Prevents damage to downstream 24 V logic ICs using only the SZMMSZ24T1G's 24 V Zener threshold and 500 mW surge capability. | Use Scenario: Generating stable 24 V reference for analog front-ends in industrial pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and excitation circuitry. Use Value: Delivers ±5% tolerance and <70 Ω dynamic impedance to maintain reference accuracy under varying sensor load conditions. |
| LED Driver Current Sense | USB-C PD Feedback Network |
Use Scenario: Setting constant current threshold in high-side LED driver feedback loop for automotive lighting. IC Role / Device Role / Timing Role: Voltage reference element in op-amp comparator circuit determining LED current trip point. Use Value: Enables accurate 24 V-based current sensing with low 0.05 μA leakage ensuring minimal error contribution at microamp-level sense currents. | Use Scenario: Providing precise 24 V feedback to USB-C Power Delivery controller in multi-rail adapter designs. IC Role / Device Role / Timing Role: Zener reference in resistive divider network setting output voltage for programmable power supply ICs. Use Value: Ensures ±5% output regulation accuracy across temperature due to AEC−Q101 validated stability and low TC drift near 24 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ24T1G | No SZ prefix; commercial grade, not AEC−Q101 qualified; same electrical specs and SOD−123 package | Not approved for automotive production; suitable for industrial or consumer prototypes | Select when AEC−Q101 compliance is unnecessary and cost sensitivity outweighs qualification requirements |
| BZX84-C24LT1G | 24 V ±5%, 300 mW rating, SOT−23 package, 80 Ω ZZT at 5 mA - lower power and higher impedance than SZMMSZ24T1G | Used in portable electronics where board space is critical but power handling is secondary | Select when footprint size (SOT−23 vs SOD−123) drives layout priority and 300 mW suffices |
Compared with MMSZ24T1G and BZX84-C24LT1G, the SZMMSZ24T1G uniquely combines automotive qualification, 500 mW power rating, and 70 Ω impedance in SOD−123 - making it optimal for ruggedized 24 V systems where reliability and thermal margin are non-negotiable.
Availability
SZMMSZ24T1G is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor signal conditioning, and 24 V power rail protection requiring stable component supply and long-term lifecycle support.
Supply support for SZMMSZ24T1G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ/SZMMSZ series is designed specifically for precision voltage regulation and transient suppression in harsh-environment electronics, emphasizing AEC−Q101 compliance, high ESD robustness, and surface-mount manufacturability.
FAQ
What is the Zener voltage tolerance of SZMMSZ24T1G?
The SZMMSZ24T1G has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 22.8 V and 25.2 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet and applies across the full operating temperature range.
Is SZMMSZ24T1G suitable for automotive applications?
Yes, SZMMSZ24T1G is AEC−Q101 qualified and PPAP capable, explicitly designated for automotive and other applications requiring unique site and control change requirements (as indicated by the "SZ" prefix). Its construction, testing, and documentation meet automotive reliability standards for use in engine control, body electronics, and ADAS subsystems.
What is the maximum power dissipation for SZMMSZ24T1G?
The SZMMSZ24T1G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that temperature. This rating assumes proper PCB copper area and thermal relief design per onsemi's recommended layout guidelines in the datasheet.
Does SZMMSZ24T1G have Pb−free packaging?
Yes, SZMMSZ24T1G is supplied in a Pb−free package, as indicated by the "G" suffix and documented in the Ordering Information section. The device complies with RoHS Directive 2011/65/EU and uses lead-free plating compatible with standard reflow soldering profiles, including peak temperatures up to 260°C for 10 seconds.
What is the reverse leakage current specification for SZMMSZ24T1G?
The reverse leakage current for SZMMSZ24T1G is specified as 0.05 μA maximum at VR = 16.8 V (70% of nominal VZ), measured at TA = 25°C. This low leakage ensures minimal parasitic current draw in voltage reference and clamp circuits, preserving accuracy in high-impedance bias networks.
SZMMSZ24T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ24T1G FAQ
1.How can I place an order for SZMMSZ24T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ24T1G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SZMMSZ24T1G reliable?
The price and inventory of SZMMSZ24T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ24T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ24T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ24T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ24T1G?
SZMMSZ24T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ24T1G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SZMMSZ24T1G?
For technical support, including SZMMSZ24T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ24T1G requirements.
6.How does Aetrix verify that SZMMSZ24T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ24T1G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SZMMSZ24T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ24T1G?
All SZMMSZ24T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ24T1G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SZMMSZ24T1G part is unused and in its original packaging.
Return procedure for SZMMSZ24T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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